i see that my two castles in the brittany region of northwest france can produce breton cavalry. they're not that useful for endgame but i just like the option of having a unique unit. i also see in southwestern france, my castle of tolouse has basque archers, and alforrat cavalry. now i'm understanding why i couldn't build my scottish pike nobles and scottish longbows in my mainland castles. even though they're locked to the british isles only, i still make them and ship them over the ocean to fight in europe. recruiting and refilling their ranks is really problematic though, and they're such widely-used troops that i feel scotland should have them as regular recruits, not special.

anyways, are unique units tied to castle recruitment only? i wanted to convert roazhoan in france into a city, but if it cuts off breton cavalry, i might keep it as a weak castle. also, is there an area of recruitment map for special units? is it the same as regular SS 6.4?